(C++) QtRoundedTextRectItem

 

 

QtRoundedEditRectItem is a Qt QGraphicsItem class that displays a rounded rectangle with text.

Technical facts

 

 

 

 

 

 

./CppQtRoundedTextRectItem/CppQtRoundedTextRectItem.pri

 

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INCLUDEPATH += \     ../../Classes/CppQtRoundedTextRectItem SOURCES += \     ../../Classes/CppQtRoundedTextRectItem/qtroundedtextrectitem.cpp HEADERS  += \     ../../Classes/CppQtRoundedTextRectItem/qtroundedtextrectitem.h OTHER_FILES += \     ../../Classes/CppQtRoundedTextRectItem/Licence.txt

 

 

 

 

 

./CppQtRoundedTextRectItem/qtroundedtextrectitem.h

 

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//--------------------------------------------------------------------------- /* QtRoundedTextRectItem, rectangular-shaped multi-line QGraphicsItem Copyright 2012-2014 Richel Bilderbeek This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program.If not, see <http://www.gnu.org/licenses/>. */ //--------------------------------------------------------------------------- //From http://www.richelbilderbeek.nl/CppQtRoundedTextRectItem.htm //--------------------------------------------------------------------------- #ifndef QTROUNDEDTEXTRECTITEM_H #define QTROUNDEDTEXTRECTITEM_H #include <string> #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #pragma GCC diagnostic ignored "-Wunused-but-set-parameter" #include <boost/signals2.hpp> #include <QFont> #include "qtroundedrectitem.h" #pragma GCC diagnostic pop namespace ribi { ///A QtRoundedTextItem displays a single line of text ///For multiple lines of text, use QtRoundedEditRectItem struct QtRoundedTextRectItem : public QtRoundedRectItem {   struct Padding   {     Padding(const double any_top = 0.0, const double any_right = 0.0, const double any_bottom = 0.0, const double any_left = 0.0)       : bottom(any_bottom), left(any_left), right(any_right), top(any_top) {}     double bottom;     double left;     double right;     double top;   };   QtRoundedTextRectItem(     const std::string& text = "...",     const Padding& padding = Padding(),     const QFont& font = QFont("monospace",9),     QGraphicsItem* parent = 0);   ///ABC must have public virtual destructor   virtual ~QtRoundedTextRectItem() noexcept {}   ///Get the font by which the text is drawn   const QFont& GetFont() const noexcept { return m_font; }   ///Get the text   const std::string& GetText() const noexcept { return m_text; }   ///Obtain the version of this class   static std::string GetVersion() noexcept;   ///Obtain the version history of this class   static std::vector<std::string> GetVersionHistory() noexcept;   ///Set the font by which the text is drawn   void SetFont(const QFont& font) noexcept;   ///Set the padding between text and rectangle   void SetPadding(const Padding& padding) noexcept;   ///Set the text displayed   void SetText(const std::string& text) noexcept;   ///Set the pen by which the text is drawn   void SetTextPen(const QPen& pen) noexcept; protected:   virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget) noexcept;   virtual void keyPressEvent(QKeyEvent* event); private:   ///The font by which the text is drawn   QFont m_font;   ///Set the padding between text and rectangle   Padding m_padding;   ///The text displayed   std::string m_text;   ///The pen by which the text is drawn   QPen m_text_pen;   ///Set the padding around text, so the text will be centered   static const Padding m_text_padding;   ///Obtain the padded text rectangle   const QRectF GetPaddedTextRect() const;   ///Obtain the unpadded text rectangle   ///Note: even this rectangle is enlarged by a pixel in both dimensions, so the text will be drawn in full   const QRectF GetTextRect() const;   ///Height of this item is determined by the text   void SetHeight(const double width) = delete;   ///Width of this item is determined by the text   void SetWidth(const double width) = delete; }; } //~namespace ribi #endif // QTROUNDEDTEXTRECTITEM_H

 

 

 

 

 

./CppQtRoundedTextRectItem/qtroundedtextrectitem.cpp

 

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//--------------------------------------------------------------------------- /* QtRoundedTextRectItem, rectangular-shaped multi-line QGraphicsItem Copyright 2012-2014 Richel Bilderbeek This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program.If not, see <http://www.gnu.org/licenses/>. */ //--------------------------------------------------------------------------- //From http://www.richelbilderbeek.nl/CppQtRoundedTextRectItem.htm //--------------------------------------------------------------------------- #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #pragma GCC diagnostic ignored "-Wunused-but-set-parameter" #include "qtroundedtextrectitem.h" #include <cassert> #include <sstream> #include <QBrush> #include <QFont> #include <QGraphicsScene> #include <QKeyEvent> #include <QInputDialog> #include <QPainter> //#include "trace.h" #pragma GCC diagnostic pop const ribi::QtRoundedTextRectItem::Padding ribi::QtRoundedTextRectItem::m_text_padding(3.0,0.0,0.0,3.0); ribi::QtRoundedTextRectItem::QtRoundedTextRectItem(   const std::string& text,   const Padding& padding,   const QFont& font,   QGraphicsItem* parent)   : QtRoundedRectItem(parent),     m_font(font),     m_padding(padding),     m_text{}, //Empty std::string, as m_text must be set by SetText     m_text_pen{} {   this->setFlags(       QGraphicsItem::ItemIsFocusable     | QGraphicsItem::ItemIsMovable     | QGraphicsItem::ItemIsSelectable);   ///Obtain a white background   this->setBrush(QBrush(QColor(255,255,255)));   this->SetFont(font);   this->SetRadiusX(4.0);   this->SetRadiusY(4.0);   this->SetText(text); } const QRectF ribi::QtRoundedTextRectItem::GetPaddedTextRect() const {   return GetTextRect().adjusted(     -m_text_padding.left,     -m_text_padding.top,      m_text_padding.right,      m_text_padding.bottom); } const QRectF ribi::QtRoundedTextRectItem::GetTextRect() const {   const double h = QFontMetricsF(m_font).height();   const double w = QFontMetricsF(m_font).width(m_text.c_str());   #ifdef _WIN32   //adjusted(0.0,0.0,2.0,0.0) works fine for 50% of the fonts supplied by Wine under native Lubuntu   //adjusted(0.0,0.0,3.0,0.0) works fine for 80% of the fonts supplied by Wine under native Lubuntu   return QRectF(-0.5 * w, -0.5 * h,w,h).adjusted(0.0,0.0,3.0,0.0);   #else   //adjusted(0.0,0.0,2.0,-1.0) works fine for 90% of the fonts under native Lubuntu   //adjusted(0.0,0.0,3.0,-1.0) works fine for 99% of the fonts under native Lubuntu   //adjusted(0.0,0.0,4.0,-1.0) works fine for all the fonts I've tried under native Lubuntu   return QRectF(-0.5 * w, -0.5 * h,w,h).adjusted(0.0,0.0,2.0,-1.0);   #endif } std::string ribi::QtRoundedTextRectItem::GetVersion() noexcept {   return "1.3"; } std::vector<std::string> ribi::QtRoundedTextRectItem::GetVersionHistory() noexcept {   return {     "2012-12-19: version 1.0: initial version",     "2012-12-20: version 1.1: added response to key press, text is displayed fully",     "2012-12-21: version 1.2: added debug drawing, text is displayed correctly to the pixel",     "2012-12-28: version 1.3: fixed incomplete displaying when using Wine",   }; } void ribi::QtRoundedTextRectItem::keyPressEvent(QKeyEvent* event) {   switch (event->key())   {     case Qt::Key_F2:     {       bool ok = true;       const QString s = QInputDialog::getText(0,"Edit text","New text",QLineEdit::Normal,m_text.c_str(),&ok);       if (ok) SetText(s.toStdString());     }     break;   }   QtRoundedRectItem::keyPressEvent(event); } void ribi::QtRoundedTextRectItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget) noexcept {   QtRoundedRectItem::paint(painter,option,widget);   painter->setFont(m_font);   //#define DISPLAY_DIFFERENT_RECTS_873658735672347834573985792   #ifdef  DISPLAY_DIFFERENT_RECTS_873658735672347834573985792   painter->setBrush(QBrush(QColor(255,0,0)));   painter->drawRect(this->GetPaddedTextRect());   painter->setBrush(QBrush(QColor(0,0,255)));   painter->drawRect(this->GetTextRect());   #endif   painter->setPen(m_text_pen);   painter->drawText(GetTextRect(),m_text.c_str()); } #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wunused-but-set-parameter" void ribi::QtRoundedTextRectItem::SetFont(const QFont& font) noexcept {   if (m_font != font)   {     m_font = font;     this->update();     //this->m_signal_item_has_updated(this);     //m_signal_request_scene_update();   } } #pragma GCC diagnostic pop void ribi::QtRoundedTextRectItem::SetPadding(const Padding& padding) noexcept {   if ( padding.bottom != m_padding.bottom     || padding.left   != m_padding.left     || padding.right  != m_padding.right     || padding.top    != m_padding.top     )   {     m_padding = padding;     const QRectF text_rect = GetPaddedTextRect();     this->SetRoundedRect(       text_rect.adjusted(         -m_padding.left,         -m_padding.top,          m_padding.right,          m_padding.bottom),       this->GetRadiusX(),       this->GetRadiusY()     );     this->update();     //this->m_signal_item_has_updated(this);     //m_signal_request_scene_update();   } } void ribi::QtRoundedTextRectItem::SetText(const std::string& text) noexcept {   if (text != m_text)   {     m_text = text;     const QRectF text_rect = GetPaddedTextRect();     this->SetRoundedRect(       text_rect.adjusted(         -m_padding.left,         -m_padding.top,          m_padding.right,          m_padding.bottom),       this->GetRadiusX(),       this->GetRadiusY()     );     this->update();     //this->m_signal_item_has_updated(this);     //m_signal_request_scene_update();   } } void ribi::QtRoundedTextRectItem::SetTextPen(const QPen& pen) noexcept {   if (m_text_pen != pen)   {     m_text_pen = pen;     this->update();     //this->m_signal_item_has_updated(this);   } }